I bought a UV (Black Light) LED flashlight originally because it reminded me of all the (black light) posters of the late 1960s and early 1970s. So, it was sort of a nostalgia of living in Venice in 1969 and going to Andy Warhol underground movies in Hollywood nearby with friends then when I was single and only 21. (However, most memories of 1969 I would rather forget at this point) Because it was the single craziest year of my life that turned literally everything upside down in my life then.
However, after I got the UV light home I realized I could get up in the night to go to the bathroom without waking up my wife who is light sensitive. A few nights ago I also realized I could leave it in the hallway bathroom between the living room and our bedroom so I don't trip over things when I go into my bedroom late at night because my wife is usually in bed by 9 or 10 and I might go to bed anytime between about 10 and 1 or 2 depending upon whether I'm sleepy or not. (I can only do this because I'm retired). However, my wife often complains about me turning on the hallway light so I don't injure myself coming in at late hours an waking her up. I realized that I could just leave this little battery UV flashlight in the bathroom so I can see well enough to not injure myself getting into bed without waking up my wife. (I'm really tired of the late night arguments when the light in the hallway wakes her up and she has trouble going to sleep afterwards). So, if you are the late night partner in a relationship this might work for you too.
Note: However, keep it away from your kids because they are not good to look directly into because they might damage your sight like other LED lights. So, don't look directly into UV or other led flash lights to keep your vision intact.
end note.
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note: I found the following under the heading "Ultraviolet" in Wikipedia under the section "Eye"
I'm not sure how helpful this is in regard to the above but I have always worn expensive sunglasses to protect my eyes in snow from mountain climbing especially at high altitudes. And one my ex-wife was snow blind for a week when she forgot her sunglasses while skiing.
However, it is my present believe that UV flashlights are safe as long as you aren't looking directly into the lens.
UV light is absorbed by molecules known as chromophores, which are present in the eye cells and tissues. Chromophores absorb light energy from the various wavelengths at different rates – a pattern known as absorption spectrum. If too much UV light is absorbed, eye structures such as the cornea, the lens, and the retina can be damaged.
Protective eyewear is beneficial to those working with or exposed to ultraviolet radiation, in particular short-wave UV. Given that light may reach the eye from the sides, full coverage eye protection is usually warranted if there is an increased risk of exposure, as in high-altitude mountaineering. Mountaineers are exposed to higher-than-ordinary levels of UV radiation, both because there is less atmospheric filtering and because of reflection from snow and ice.
Ordinary, untreated eyeglasses give some protection. Most plastic lenses give more protection than glass lenses, because, as noted above, glass is transparent to UVA and the common acrylic plastic used for lenses is less so. Some plastic lens materials, such as polycarbonate, inherently block most UV. There are protective treatments available for eyeglass lenses that need it, which will give better protection. But even a treatment that completely blocks UV will not protect the eye from light that arrives around the lens.
end quote from:
Eye
note: I found the following under the heading "Ultraviolet" in Wikipedia under the section "Eye"
I'm not sure how helpful this is in regard to the above but I have always worn expensive sunglasses to protect my eyes in snow from mountain climbing especially at high altitudes. And one my ex-wife was snow blind for a week when she forgot her sunglasses while skiing.
However, it is my present believe that UV flashlights are safe as long as you aren't looking directly into the lens.
Eye
High intensities of UVB light are hazardous to the eyes, and exposure can cause welder's flash (photokeratitis or arc eye) and may lead to cataracts, pterygium,[47][48] and pinguecula formation.UV light is absorbed by molecules known as chromophores, which are present in the eye cells and tissues. Chromophores absorb light energy from the various wavelengths at different rates – a pattern known as absorption spectrum. If too much UV light is absorbed, eye structures such as the cornea, the lens, and the retina can be damaged.
Protective eyewear is beneficial to those working with or exposed to ultraviolet radiation, in particular short-wave UV. Given that light may reach the eye from the sides, full coverage eye protection is usually warranted if there is an increased risk of exposure, as in high-altitude mountaineering. Mountaineers are exposed to higher-than-ordinary levels of UV radiation, both because there is less atmospheric filtering and because of reflection from snow and ice.
Ordinary, untreated eyeglasses give some protection. Most plastic lenses give more protection than glass lenses, because, as noted above, glass is transparent to UVA and the common acrylic plastic used for lenses is less so. Some plastic lens materials, such as polycarbonate, inherently block most UV. There are protective treatments available for eyeglass lenses that need it, which will give better protection. But even a treatment that completely blocks UV will not protect the eye from light that arrives around the lens.
end quote from:
Eye
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